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Rare earth doped optical microcavity and preparation method thereof

An optical microcavity and rare earth doping technology, which is applied in the direction of lasers, laser components, and the structure/shape of active media, can solve the problems of lack of high-Q optical microcavity preparation methods, avoid scattering loss, and make preparation technology flexible , the effect of extremely low cost

Active Publication Date: 2021-10-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In summary, the prior art still lacks a method for preparing a high-Q optical microcavity with a Q value exceeding ten to the seventh power

Method used

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  • Rare earth doped optical microcavity and preparation method thereof
  • Rare earth doped optical microcavity and preparation method thereof
  • Rare earth doped optical microcavity and preparation method thereof

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0028] A rare earth-doped optical microcavity is prepared by the following method:

[0029] (1) The single-mode optical fiber 1 stripped of the coating is fixed on the bracket, and it is heated and melted by a focused carbon dioxide laser beam 2, as figure 1 As shown, the carbon dioxide laser wavelength is 10.6 microns. Under the action of the gravity of the single-mode fiber itself, the fiber will be thinned to about 5 microns in diameter by heating with 300mW carbon dioxide laser power at the beam focus. Finally, a laser is used to heat and fuse the single-mode fiber below to form a bottle-shaped whispering gallery mode optical microcavity with a diameter of 50 microns.

[0030] (2) the prepared bottle cavity is immersed in the mixed solution 3 of polymethyl methacrylate PMMA, erbium nitrate pentahydrate, acetone, and then extracted from the mixed solution 3 to obtain the bottle cavity whose surface covers the polymer film 4, such as figure 2 As shown, the mixed solution ...

Embodiment 2

[0033] The difference between this embodiment and Embodiment 1 is that the power of the carbon dioxide laser is different, specifically 600 mW.

Embodiment 3

[0035] The difference between this example and Example 1 is that the rare earth element compounds in the mixed solution 3 are different, specifically, the mixed solution is fully mixed with PMMA, ytterbium nitrate pentahydrate, and acetone at a mass ratio of 1:16:100.

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Abstract

The invention belongs to the technical field of photoelectricity, and particularly relates to a rare earth doped optical microcavity and a preparation method thereof. The preparation method comprises the following steps of (1) fixing a single-mode optical fiber without a coating layer, and ablating the single-mode optical fiber into a bottle cavity by using laser; (2) dissolving a high-molecular polymer and a rare earth element compound in an organic solvent to obtain a mixed solution, immersing the bottle cavity into the mixed solution, and then taking out the bottle cavity from the mixed solution to obtain a bottle cavity of which the surface is covered with a high-molecular film; and (3) melting the bottle cavity with the surface covered with the polymer film into a ball cavity through laser heating. According to the invention, firstly a layer of film uniformly doped with the rare earth elements is formed on the surface of the bottle cavity by utilizing the adsorption effect of the film, then the film is ablated and removed by laser, the rare earth elements are uniformly doped into the microcavity, and finally, the doped microcavity with an ultrahigh Q value is realized.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and in particular relates to a rare earth-doped optical microcavity and a preparation method thereof. Background technique [0002] Low-threshold, narrow-linewidth microlasers are one of the frontiers of basic research and technology applications today. In recent years, silicon oxide-based ultrahigh-Q whispering gallery mode optical microcavities have attracted great attention in nonlinear optics, cavity optomechanics, microlasers, and optical sensing. In addition, the luminescence of rare earth elements can cover from the ultraviolet to the near-infrared region, which has broad prospects for laser applications. If the rare earth elements can be uniformly doped into the microcavity and maintain its ultra-high Q value, ultra-low-threshold narrow-linewidth microlasers can be realized. Traditional rare earth element doping methods include ion implantation and sol-gel methods. The ion impl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/06H01S3/067
CPCH01S3/0627H01S3/06716H01S3/06708
Inventor 施雷姜博张新亮
Owner HUAZHONG UNIV OF SCI & TECH